it is supposed too. but you can just do it yourself by plugging the usb 4g to the router. Wait for 48 hours before it is activated.

you should plug in first, once its activated, you can use it separately

i had asked the agent from Maxis, actually it is ok provided you can confirm that your 4G coverage in your area is not that good. Like mine, when at home, the 4G line is terrible, i had to resort using separate 4G router with antenna just to get coverage, so they are okay with it.